package filter;

import javabean.User;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter("/main.jsp")
public class LoginFilter implements Filter {

    public void destroy() { }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpSession session = ((HttpServletRequest)req).getSession();
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)resp;
        User loginUser = (User) session.getAttribute("loginUser");
        if (loginUser == null){
            response.sendRedirect(request.getContextPath()+"/login.jsp");
        }else{
            chain.doFilter(req, resp);
        }
    }

    public void init(FilterConfig config) throws ServletException { }
}

